What is Simple random sampling?

Simple random sampling means that every member of the sample is selected from the group of population in such a manner that the probability of being selected for all members in the study group of population is the same.

Image: Simple random sampling

In other words, sampling units are selected at random so that the opportunity of every sampling unit being included in the sample is the same. This is the basic method of sampling. In this method, numbers are assigned to every member in the study group of population. Then the sample would be selected from a table of random numbers or random selection.